Home / 21,091.67-31,621.84-12,769.70

Finding the Fourth Proportional to 21,091.67, 31,621.84 and 12,769.70

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Solution

The fourth proportional to 21,091.67, 31,621.84 and 12,769.70 is: 19,145.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,091.67 : 31,621.84 = 12,769.70 : x
  2. Step 2: Convert to fraction form
    21,091.67/31,621.84 = 12,769.70/x
  3. Step 3: Cross multiply
    21,091.67x = 31,621.84 × 12,769.70
  4. Step 4: Simplify right side
    21,091.67x = 403,801,469.92
  5. Step 5: Solve for x
    x = 403,801,469.92/21,091.67
  6. Step 6: Final answer
    x = 19,145.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.